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Nixon extended the Vietnam war, because he didn't want it to end before the election.
https://www.smithsonianmag.com/smart-news/nixon-prolonged-vietnam-war-for-political-gainand-johnson-knew-about-it-newly-unclassified-tapes-suggest-3595441/
My first thought also, and I strongly recommend Ken Burns' Vietnam War doco to those who haven't seen it - that's where I first learned of Nixon's unforgivable treason (about this particular topic... not to mention his other treasons).
See also Fear and Loathing on the Campaign Trail by HST.
And Trump has acted similarly in the past year.